Question

Which pair of glands are dual in origin:

• A. Adrenal gland and Placenta
• B. Pituitary gland and Adrenal gland
• C. Thyroid gland and Pituitary gland
• D. Pituitary gland and pineal gland

Hint:

The adrenal and pituitary glands are dual in origin, meaning they develop from more than one type of tissue during embryonic development.

Answer 1

The Correct Option is B

Step 1: Dual-origin glands are those that develop from two different embryonic tissues. The adrenal gland develops from both mesoderm and neural crest cells, while the pituitary gland has two parts: the anterior part arises from the ectoderm, and the posterior part arises from neural tissue.

Step 2:
- (A) Adrenal gland and Placenta: The adrenal gland is dual in origin, but the placenta develops entirely from the trophoblast and maternal tissues.
- (C) Thyroid gland and Pituitary gland: The thyroid gland develops from endoderm, and the pituitary from ectoderm and neural tissue, but it is not considered dual in origin.
- (D) Pituitary gland and pineal gland: The pituitary is dual in origin, but the pineal gland arises from the ectoderm.

Conclusion: The pituitary gland and adrenal gland are dual in origin, making \( (B) \) the correct answer.